Lines Matching defs:alpha
10 // Alpha-plane decompression.
26 // Allocates a new alpha decoder instance.
32 // Clears and deallocates an alpha decoder instance.
44 // Initialize alpha decoding by parsing the alpha header and decoding the image
45 // header for alpha data stored using lossless compression.
46 // Returns false in case of error in alpha header (data too short, invalid
106 // Decodes, unfilters and dequantizes *at least* 'num_rows' rows of alpha
198 // if we allowed use of alpha dithering, check whether it's needed at all
214 uint8_t* const alpha = dec->alpha_plane_ + io->crop_top * width
216 if (!WebPDequantizeLevels(alpha,
